Github user mengxr commented on the pull request:
https://github.com/apache/spark/pull/7222#issuecomment-119227666
We should split this PR, keep only the changes to `dot`, and test the
`assume_unique` flag. On a separate PR, let's test the performance about
`square_distance`. The currently implementation of `square_distance` is not
trivial to understand. We should iterate more before merge.
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